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    <script>
        //6. 编写函数norepeat(arr) 将数组的重复元素去掉，并返回新的数组
        var arr = [1, 1, 2, 3, 4, 4, 2, 1, 3, 5]
        var arr1 = []
        function norepeat(arr) {
            
            
            for(var i = 0 ; i < arr.length ;i++){
                if(arr1.indexOf(arr[i]) === -1){
                    arr1.push(arr[i])
                }
            }
            return arr1
        }
        
        console.log(norepeat(arr)) // [1, 2, 3, 4, 5]
    </script>
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